when will you start sending your child for classess ? do you think they learn much when they are so young? Will it cause stress to them as some of my friend send child to classess as young as 6-8months

Can consider to join/start a playgroup. An instructor will show what activities suitable for babies, how to do it, the equipments etc. The duration usually not long, parents need to join because they are the one doing activities with their babies, which is better and healthier for bonding, also of course baby loves to spend time with their parents.